HP StorageWorks XP Remote Web Console Software - Manual (Page 26)

Table 14 Requirements of the S-VOL of XP Snapshot
Item Requirement
Volume type
V-VOL
You cannot specify the following volumes as XP Snapshot S-VOLs.
• Volumes used as S-VOLs of XP Snapshot pairs
• Volumes used by a pair or migration plan of another program product
Note: A LUSE S-VOL must be paired with a P-VOL of the same size and the same
structure.
Emulation type OPEN-V
Maximum number
16,384
For details about the maximum number of XP Snapshot pairs that can be created,
see “ Calculating Maximum Number of Pairs ” on page 27.
Path definition Required
Table 15 Requirements of the Pool-VOL of XP Snapshot
Item Requirement
Volume type
Logical volume (LDEV)
Note : Separating normal volumes and pool-VOLs into different parity groups is
recommended for the best performance.
You cannot specify the following volumes as XP Snapshot pool-VOLs.
• Volumes whose LDEV attribute is other than normal
• LUSE volumes
• Volumes used as P-VOLs or S-VOLs of XP Snapshot pairs
• Volumes already registered in pools of XP Snapshot or XP Thin Provisioning
• Volumes used by a pair or migration plan of another program product
• Volumes that are set with the Protect or Read Only attribute, or the S-VOL
Disable setting by Data Retention Utility
• Volumes that have Cache Residency Manager settings
Emulation type OPEN-V
RAID level
All RAID levels are supported. You may register pool-VOLs whose RAID levels
are different in the same pool; however, HP recommends that you specify the
same RAID level for pool-VOLs registered in the same pool so that performance
is not decreased.
Drive type
All drive types are supported. You may register pool-VOLs whose drive types
are different in the same pool; however, HP recommends that you specify the
same drive type for pool-VOLs registered in the same pool so that performance
is not decreased.
Maximum number
8,192
However, the maximum number of pool-VOLs that can be registered in each pool
is 256. That is, you can create up to 32 pools in one storage system.
In addition, the volume already registered as a pool-VOL in a pool cannot
be registered in another pool. Also note that if you create pools for XP Thin
Provisioning, the number of available pools for XP Snapshot will decrease
according to the number of XP Thin Provisioning pools.
Volume capacity
8 GB to 2 TB.
Note : Dividing a parity group into 16 volumes is recommended for the best
performance.
Path definition
Not required.
The volumes with path definition cannot be specified as a pool-VOL
26 Preparing for XP Snapshot Operations